/**
 * Copyright (C) 2011 Whisper Systems
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.appspot.eusms.contacts;

import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.MergeCursor;
import android.net.Uri;
import android.os.Parcel;
import android.os.Parcelable;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.Im;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.provider.ContactsContract.Contacts;
import android.provider.ContactsContract.Data;
import android.provider.ContactsContract.PhoneLookup;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.telephony.PhoneNumberUtils;
import android.util.Log;

import org.whispersystems.textsecure.crypto.IdentityKey;
import org.whispersystems.textsecure.crypto.InvalidKeyException;
import org.whispersystems.textsecure.directory.Directory;
import org.whispersystems.textsecure.util.Base64;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;

/**
 * This class was originally a layer of indirection between
 * ContactAccessorNewApi and ContactAccesorOldApi, which corresponded
 * to the API changes between 1.x and 2.x.
 * <p/>
 * Now that we no longer support 1.x, this class mostly serves as a place
 * to encapsulate Contact-related logic.  It's still a singleton, mostly
 * just because that's how it's currently called from everywhere.
 *
 * @author Moxie Marlinspike
 */

public class ContactAccessor {

    public static final String PUSH_COLUMN = "push";

    private static final ContactAccessor instance = new ContactAccessor();

    public static synchronized ContactAccessor getInstance() {
        return instance;
    }

    public CursorLoader getCursorLoaderForContactsWithNumbers(Context context) {
        Uri uri = Contacts.CONTENT_URI;
        String selection = Contacts.HAS_PHONE_NUMBER + " = 1";

        return new CursorLoader(context, uri, null, selection, null,
                Contacts.DISPLAY_NAME + " ASC");
    }

    public CursorLoader getCursorLoaderForContactGroups(Context context) {
        return new CursorLoader(context, ContactsContract.Groups.CONTENT_URI,
                null, null, null, ContactsContract.Groups.TITLE + " ASC");
    }

    public Loader<Cursor> getCursorLoaderForContacts(Context context, String filter) {
        return new ContactsCursorLoader(context, filter, false);
    }

    public Loader<Cursor> getCursorLoaderForPushContacts(Context context, String filter) {
        return new ContactsCursorLoader(context, filter, true);
    }

    public Cursor getCursorForContactsWithNumbers(Context context) {
        Uri uri = Contacts.CONTENT_URI;
        String selection = Contacts.HAS_PHONE_NUMBER + " = 1";

        return context.getContentResolver().query(uri, null, selection, null,
                Contacts.DISPLAY_NAME + " ASC");
    }

    public Collection<ContactData> getContactsWithPush(Context context) {
        final ContentResolver resolver = context.getContentResolver();
        final String[] inProjection = new String[]{PhoneLookup._ID, PhoneLookup.DISPLAY_NAME};

        List<String> pushNumbers = Directory.getInstance(context).getActiveNumbers();
        final Collection<ContactData> lookupData = new ArrayList<ContactData>(pushNumbers.size());

        for (String pushNumber : pushNumbers) {
            Uri uri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(pushNumber));
            Cursor lookupCursor = resolver.query(uri, inProjection, null, null, null);
            try {
                if (lookupCursor != null && lookupCursor.moveToFirst()) {
                    final ContactData contactData = new ContactData(lookupCursor.getLong(0), lookupCursor.getString(1));
                    contactData.numbers.add(new NumberData("TextSecure", pushNumber));
                    lookupData.add(contactData);
                }
            } finally {
                if (lookupCursor != null)
                    lookupCursor.close();
            }
        }
        return lookupData;
    }

    public String getNameFromContact(Context context, Uri uri) {
        Cursor cursor = null;

        try {
            cursor = context.getContentResolver().query(uri, new String[]{Contacts.DISPLAY_NAME},
                    null, null, null);

            if (cursor != null && cursor.moveToFirst())
                return cursor.getString(0);

        } finally {
            if (cursor != null)
                cursor.close();
        }

        return null;
    }

    public String getNameForNumber(Context context, String number) {
        Uri uri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(number));
        Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);

        try {
            if (cursor != null && cursor.moveToFirst())
                return cursor.getString(cursor.getColumnIndexOrThrow(PhoneLookup.DISPLAY_NAME));
        } finally {
            if (cursor != null)
                cursor.close();
        }

        return null;
    }

    public GroupData getGroupData(Context context, Cursor cursor) {
        long id = cursor.getLong(cursor.getColumnIndexOrThrow(ContactsContract.Groups._ID));
        String title = cursor.getString(cursor.getColumnIndexOrThrow(ContactsContract.Groups.TITLE));

        return new GroupData(id, title);
    }

    public ContactData getContactData(Context context, Cursor cursor) {
        return getContactData(context,
                cursor.getString(cursor.getColumnIndexOrThrow(Contacts.DISPLAY_NAME)),
                cursor.getLong(cursor.getColumnIndexOrThrow(Contacts._ID)));
    }

    public ContactData getContactData(Context context, Uri uri) {
        return getContactData(context, getNameFromContact(context, uri), Long.parseLong(uri.getLastPathSegment()));
    }

    private ContactData getContactData(Context context, String displayName, long id) {
        ContactData contactData = new ContactData(id, displayName);
        Cursor numberCursor = null;

        try {
            numberCursor = context.getContentResolver().query(Phone.CONTENT_URI, null,
                    Phone.CONTACT_ID + " = ?",
                    new String[]{contactData.id + ""}, null);

            while (numberCursor != null && numberCursor.moveToNext()) {
                int type = numberCursor.getInt(numberCursor.getColumnIndexOrThrow(Phone.TYPE));
                String label = numberCursor.getString(numberCursor.getColumnIndexOrThrow(Phone.LABEL));
                String number = numberCursor.getString(numberCursor.getColumnIndexOrThrow(Phone.NUMBER));
                String typeLabel = Phone.getTypeLabel(context.getResources(), type, label).toString();

                contactData.numbers.add(new NumberData(typeLabel, number));
            }
        } finally {
            if (numberCursor != null)
                numberCursor.close();
        }

        return contactData;
    }

    public List<ContactData> getGroupMembership(Context context, long groupId) {
        LinkedList<ContactData> contacts = new LinkedList<ContactData>();
        Cursor groupMembership = null;

        try {
            String selection = ContactsContract.CommonDataKinds.GroupMembership.GROUP_ROW_ID + " = ? AND " +
                    ContactsContract.CommonDataKinds.GroupMembership.MIMETYPE + " = ?";
            String[] args = new String[]{groupId + "",
                    ContactsContract.CommonDataKinds.GroupMembership.CONTENT_ITEM_TYPE};

            groupMembership = context.getContentResolver().query(Data.CONTENT_URI, null, selection, args, null);

            while (groupMembership != null && groupMembership.moveToNext()) {
                String displayName = groupMembership.getString(groupMembership.getColumnIndexOrThrow(Data.DISPLAY_NAME));
                long contactId = groupMembership.getLong(groupMembership.getColumnIndexOrThrow(Data.CONTACT_ID));

                contacts.add(getContactData(context, displayName, contactId));
            }
        } finally {
            if (groupMembership != null)
                groupMembership.close();
        }

        return contacts;
    }

    public List<String> getNumbersForThreadSearchFilter(String constraint, ContentResolver contentResolver) {
        LinkedList<String> numberList = new LinkedList<String>();
        Cursor cursor = null;

        try {
            cursor = contentResolver.query(Uri.withAppendedPath(Phone.CONTENT_FILTER_URI,
                            Uri.encode(constraint)),
                    null, null, null, null
            );

            while (cursor != null && cursor.moveToNext()) {
                numberList.add(cursor.getString(cursor.getColumnIndexOrThrow(Phone.NUMBER)));
            }

        } finally {
            if (cursor != null)
                cursor.close();
        }

        return numberList;
    }

    public CharSequence phoneTypeToString(Context mContext, int type, CharSequence label) {
        return Phone.getTypeLabel(mContext.getResources(), type, label);
    }

    public void insertIdentityKey(Context context, List<Long> rawContactIds, IdentityKey identityKey) {
        for (long rawContactId : rawContactIds) {
            Log.w("ContactAccessorNewApi", "Inserting data for raw contact id: " + rawContactId);
            ContentValues contentValues = new ContentValues();
            contentValues.put(Data.RAW_CONTACT_ID, rawContactId);
            contentValues.put(Data.MIMETYPE, Im.CONTENT_ITEM_TYPE);
            contentValues.put(Im.PROTOCOL, Im.PROTOCOL_CUSTOM);
            contentValues.put(Im.CUSTOM_PROTOCOL, "TextSecure-IdentityKey");
            contentValues.put(Im.DATA, Base64.encodeBytes(identityKey.serialize()));

            context.getContentResolver().insert(Data.CONTENT_URI, contentValues);
        }
    }

    public IdentityKey importIdentityKey(Context context, Uri uri) {
        long contactId = getContactIdFromLookupUri(context, uri);
        String selection = Im.CONTACT_ID + " = ? AND " + Im.PROTOCOL + " = ? AND " + Im.CUSTOM_PROTOCOL + " = ?";
        String[] selectionArgs = new String[]{contactId + "", Im.PROTOCOL_CUSTOM + "", "TextSecure-IdentityKey"};

        Cursor cursor = context.getContentResolver().query(Data.CONTENT_URI, null, selection, selectionArgs, null);

        try {
            if (cursor != null && cursor.moveToFirst()) {
                String data = cursor.getString(cursor.getColumnIndexOrThrow(Im.DATA));

                if (data != null)
                    return new IdentityKey(Base64.decode(data), 0);

            }
        } catch (InvalidKeyException e) {
            Log.w("ContactAccessorNewApi", e);
            return null;
        } catch (IOException e) {
            Log.w("ContactAccessorNewApi", e);
            return null;
        } finally {
            if (cursor != null)
                cursor.close();
        }

        return null;
    }

    private long getContactIdFromLookupUri(Context context, Uri uri) {
        Cursor cursor = null;

        try {
            cursor = context.getContentResolver().query(uri,
                    new String[]{Contacts._ID},
                    null, null, null);

            if (cursor != null && cursor.moveToFirst()) {
                return cursor.getLong(0);
            } else {
                return -1;
            }

        } finally {
            if (cursor != null)
                cursor.close();
        }
    }

    public static class NumberData implements Parcelable {

        public static final Creator<NumberData> CREATOR = new Creator<NumberData>() {
            public NumberData createFromParcel(Parcel in) {
                return new NumberData(in);
            }

            public NumberData[] newArray(int size) {
                return new NumberData[size];
            }
        };

        public final String number;
        public final String type;

        public NumberData(String type, String number) {
            this.type = type;
            this.number = number;
        }

        public NumberData(Parcel in) {
            number = in.readString();
            type = in.readString();
        }

        public int describeContents() {
            return 0;
        }

        public void writeToParcel(Parcel dest, int flags) {
            dest.writeString(number);
            dest.writeString(type);
        }
    }

    public static class GroupData {
        public final long id;
        public final String name;

        public GroupData(long id, String name) {
            this.id = id;
            this.name = name;
        }
    }

    public static class ContactData implements Parcelable {

        public static final Creator<ContactData> CREATOR = new Creator<ContactData>() {
            public ContactData createFromParcel(Parcel in) {
                return new ContactData(in);
            }

            public ContactData[] newArray(int size) {
                return new ContactData[size];
            }
        };

        public final long id;
        public final String name;
        public final List<NumberData> numbers;

        public ContactData(long id, String name) {
            this.id = id;
            this.name = name;
            this.numbers = new LinkedList<NumberData>();
        }

        public ContactData(long id, String name, List<NumberData> numbers) {
            this.id = id;
            this.name = name;
            this.numbers = numbers;
        }


        public ContactData(Parcel in) {
            id = in.readLong();
            name = in.readString();
            numbers = new LinkedList<NumberData>();
            in.readTypedList(numbers, NumberData.CREATOR);
        }

        public int describeContents() {
            return 0;
        }

        public void writeToParcel(Parcel dest, int flags) {
            dest.writeLong(id);
            dest.writeString(name);
            dest.writeTypedList(numbers);
        }
    }

    /**
     * If the code below looks shitty to you, that's because it was taken
     * directly from the Android source, where shitty code is all you get.
     */

    public Cursor getCursorForRecipientFilter(CharSequence constraint,
                                              ContentResolver mContentResolver) {
        final String SORT_ORDER = Contacts.TIMES_CONTACTED + " DESC," +
                Contacts.DISPLAY_NAME + "," + Phone.TYPE;

        final String[] PROJECTION_PHONE = {
                Phone._ID,                  // 0
                Phone.CONTACT_ID,           // 1
                Phone.TYPE,                 // 2
                Phone.NUMBER,               // 3
                Phone.LABEL,                // 4
                Phone.DISPLAY_NAME,         // 5
        };

        String phone = "";
        String cons = null;

        if (constraint != null) {
            cons = constraint.toString();

            if (RecipientsAdapter.usefulAsDigits(cons)) {
                phone = PhoneNumberUtils.convertKeypadLettersToDigits(cons);
                if (phone.equals(cons) && !PhoneNumberUtils.isWellFormedSmsAddress(phone)) {
                    phone = "";
                } else {
                    phone = phone.trim();
                }
            }
        }
        Uri uri = Uri.withAppendedPath(Phone.CONTENT_FILTER_URI, Uri.encode(cons));
        String selection = String.format("%s=%s OR %s=%s OR %s=%s",
                Phone.TYPE,
                Phone.TYPE_MOBILE,
                Phone.TYPE,
                Phone.TYPE_WORK_MOBILE,
                Phone.TYPE,
                Phone.TYPE_MMS);

        Cursor phoneCursor = mContentResolver.query(uri,
                PROJECTION_PHONE,
                null,
                null,
                SORT_ORDER);

        if (phone.length() > 0) {
            ArrayList result = new ArrayList();
            result.add(Integer.valueOf(-1));                    // ID
            result.add(Long.valueOf(-1));                       // CONTACT_ID
            result.add(Integer.valueOf(Phone.TYPE_CUSTOM));     // TYPE
            result.add(phone);                                  // NUMBER

    /*
    * The "\u00A0" keeps Phone.getDisplayLabel() from deciding
    * to display the default label ("Home") next to the transformation
    * of the letters into numbers.
    */
            result.add("\u00A0");                               // LABEL
            result.add(cons);                                   // NAME

            ArrayList<ArrayList> wrap = new ArrayList<ArrayList>();
            wrap.add(result);

            ArrayListCursor translated = new ArrayListCursor(PROJECTION_PHONE, wrap);

            return new MergeCursor(new Cursor[]{translated, phoneCursor});
        } else {
            return phoneCursor;
        }
    }

}
